Sofa



FIG. 1 is a front perspective view, from slightly above, showing the front and side ends of the sofa;

FIG. 2 is an end perspective view, from slightly above, of the sofa;

FIG. 3 is a top view of the sofa, also showing the back from its top edge; and,

FIG. 4 is a bottom view of the sofa. 

The ornamental design for a sofa, as shown and described. 